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基于耦合模理论,得出了三角结构三芯光子晶体光纤(TTC-PCF)的耦合模方程.数值模拟研究了该结构中纤芯间的定向耦合特性,分析了光纤结构及入射波长对耦合系数的影响以及入射光振幅比对纤芯间能量耦合特性的影响.结果表明,通过调节入射光振幅比可实现对纤芯间耦合强度的连续调节.对比了耦合模理论与束传播法得到的结果,两者表现出很好的一致性.结合TTC-PCF展现的独特耦合传输性能,讨论了其在耦合强度连续可调光纤定向耦合器和大模场光纤激光器的设计与制备等方面的可能应用前景.
Based on the coupled-mode theory, the coupled-mode equations of tri-core photonic crystal fiber (TTC-PCF) were obtained. The directional coupling characteristics of the three-core photonic crystal fiber (TTC-PCF) were obtained by numerical simulation. The effects of fiber structure and incident wavelength on the coupling coefficient And the effect of the incident light amplitude ratio on the energy coupling between the cores are also discussed.The results show that the continuous adjustment of the coupling strength between the cores can be achieved by adjusting the amplitude ratio of the incident light.Compared the coupling mode theory with the beam propagation method , Both of which show good consistency.Combined with the unique coupling transmission performance exhibited by TTC-PCF, the possible applications in the design and preparation of fiber-optic directional couplers and large-mode fiber lasers with continuously adjustable coupling strength are discussed prospect.